Usury Rate: The average coupon equivalent yield from the first auction of 26-week treasury bills in August 1999 is 5.525 percent. The maximum allowable interest rate for September is therefore 12.00% percent. Compilations of the average coupon equivalent yields from past auctions of 26-week treasury bills and past maximum interest rates for January 1989 – present appear in the current issue of the Bar News. Information from January 1987 to date is available online